A superorder or subclass of primitive sea urchins that includes the family Cidaridae and related ancient urchin groups.
From Cidaris plus -oida, a suffix meaning 'resembling' or 'like,' used in taxonomy to denote larger groupings of similar organisms.
The -oida suffix groups together organisms that share ancient ancestry—cidaroids are like the 'grandparents' of all modern sea urchins, still keeping their old-fashioned body plan.
Complete word intelligence in one call. Free tier — 50 lookups/day.